Computing attachment for type-writers.



w. WRIGHT.' COMPUTING ATTACHMENT FOR TYPE WRITERS.

APPLICATION FILED MAR. 22| 1909.

Patented Oct. 23,1917.

s SHEETS-SHEET l.

uli

n.. mw o 1 mw T W- mvanirok l ATTORNEY W. WRIGHT. COMPUTING ATTACHMENT FOR TYPE WRITERS;

APPLICATION FILED MAR. 22. 1909.

- Patented Oct. 23,1917.

8 SHEETS-SHEET 2.

mvramonl wrm EssEs WM f/f4 Maya,

ATTORNEY W. WRIGHT.

COMPUTING AUACHMENI FOR TYPE WRITERS.

APPLICATION FILED MAR. 221 1909.

n. 1 9 l 00.. 2 Lb' DU 0 m n e t ow D* INVENTOII, Wfl/@12 MW,

v BY

ATTORNEY I w. WRIGHT..

COMPUTING ATTACHMENT FOR TYPE WRITERS.

APPLlcATloN FILED MAR. 22. 1909.

1,244,397. Patenta oct. 23,1917.

8 SHEETS-SHEET 4.

wlTNEssEs INVENTOR I n l BY ATTORNEY Y w. WRIGHT. COMPUTING ATTACHMENT Foa TYPE wmTEns.

APPLICATION FILED HMT-22. |909.

` Phtentd Oct. 23,1917.

8 SHEETSMSHEET 5.

WITNESSES ATTQRNEY W. WRIGHT. COMPU'TINGATTACHMENT FOR TYPE WRITEB,

APPLICATION FILED MAR. 22. 1909. v

Pgtentd Oct. 23,1917.

@v EQ,

B SHEETS-SHEET 6.

WITN ESSES W. WRIGHT. I' COMPUTING ATTACHMENT F'OH TYPE WRITERS.

V APPLICATIDN FILED NAR. 22. 1909. 1,244,397.' v Patented oet. 23,1917.

- 8 SHEETS-SHEET T.

Y L ZV wlmesses s E I myENTOR 'masasd (JM. l

W. WRIGHT.

'COMUTING ATTACHMENT FUR TYPE WRITERS. APPLICATION FILED ma. 22. |909.

i 1,244,397. Patented oet. 23,1917.

8 SHEETS-SHEET B.

' I l I v Arron-Nev.

VUNITED STATES PATENT ermee.

WALTER WRIGHT, 0F SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, T0 UNDERWOOD COMPUTING MACHINE COMPANY, A CORPORATION 0F NEW YORK.

lSpccicatlcn of Letters Patent.

Patented Oct. 23, 1917.

Application led March 22, 1909. Serial No. 485,046.

To all whom it may concern.'

Be it known that I, WALTER VRIGHT, a' citizen of the United States, residing at San Francisco, in the 'county of San Fran cisco and State of California, have invented new and useful Improvements in Computing Attachments for Typewriters, of which the following is a specification.

The present invention relates to computing attachments for typewriters, although it is to be understood that the invention may be embodied in an independent machine.

The object of the invention is to provide an apparatus of this character comprising improved means for simultaneouslycomputing columns of figures vertically and horizontally or securlng vertical footings and cross-footings; also one wherein' great variability is obtained in the' size and arrangement of the various columns so computed; and one in which the intervenin space be tweenthe different columns maye reduced to the same extent as the variability of the columns. I rovidein such an4 apparatus a plurality o computing mechanisms, either of which may be stationary or movable, each one having an independent operator which may-be driven in either directiomor rendered inoperative at will, independently of the other; also means whereby the first column to be computed horizontally may be commenced as close to theleft hand margin of the `paper as may be desired, whatever be the size of the column; also means whereby the computin mechanism may be4 disconnected from ie typewriter carriage, when desired, so as to avoid the necessity of moving .the movable elements of the two computingmeans and for disconnecting either, whereby only one of said elements is thenj capable of being operated; also, in such an apparatus, a plurality of computin mechanlsms, individual actuators there or, and means for producing lntermlttent move-l ments of each actuator, relative to its cor-ref spending computing' mechanism.

therefrom; Fig. 7 is a broken vertical trans verse section of the front portion of the machine, particularly showing the parts illustrated in Figs. 3 to 6; Fig. 8 is a broken plan view of the computing controller; Fig. 9 is a sectional view of the same, showing the parts Vin4 a different position; Fig. 10^is a cross section taken in front of the controller; Fig. 11 is-a cross section on the line m-m of Fig. 8; Fi .12' is a. perspective view showlng the sa ety connections between the controller and thetypewriter escapement;` Fig. 12a is a side view of part of said connections; Fig. 13 is a front view, partly in section .through a portion of the computing mechanism; Fig. 14 is a bottom plan-view of the same, partly broken away; Fig. 15 is a transverse vertical section of the same; Fig. 16 is a perspective view, on a reduced scale, of one of the washers; Fig. 17 isa perspective view of one of the transfer wheels; Fig. 18 is a similar view of the same on the opposite sideV to that of Fig. 17;Fig. 19 is a perspectiveview of one ofthe computing wheels; Fig. 20 is a View, similar to Fig. 17, of one of the transfer wheels which extends through a partition; Fig. '21 is a broken plan view, partly in section, of the Vactuator shaft and the tube moving with the actuator; Fig. 22 is a. perspective view of the actuator; Fig. 23 is a. detail front view showing a partition and parts Vconnected therewith; Fig. 24 is an enlarged detail front view of connections between two computingA mechanisms; Fig. 25 is a plan view o f the column stop' bar; F10. 26 is a cross section on the line y-y ofe Fig. 24; Fig.

27 is a similar View on the line z--z of Fig. 24; Fig. 28 is a detail perspective view, showing the mechanism for locking at each fourth writin space; Fig. 29 is an en d view -showing the riving mechanism; Fig. 30 is a detail front view of a modified invention.

' General use.--'l `he drawings'show the inform of the vention as applied to a Remington ty ewriter, but it is to. be understood that, with suitable changes, it may be applied to atypewriter of any standard construction, and also that the invention may be embodied in the form of a computing machine, or a computing and printing machine, complete in itself, and no t attached to a typewrifing machine.

Iieg/ connection control-Secured tothe frame lof the typewriting machine is a ver tical plate Q extending longitudinally of the machine over the key levers 3, (Figs. 1` and 3 to 7) ;'and, secured upon the front side of said plate 2, are guides 4 for a slide bar 5. Through holes in said slide bar pass the stems 6 of hooks 7, said hooks. being adapted to enter eyes 3 in loops 49 secured around the numeral key levers 10. Said hook stems, in the manner to be presently described, constitute the means for controlling the operation' of the computing mechanism. It is sufficient for the present to observe. that, when said hooks are in engagement with said eyes ,said means are in operative position, so 'that through the depression of the numeral keys the computing mechanism is actuated,

but',v when theslide bar is moved to the right so that the hooks are disengaged. from said eyes, the computing mechanism is disconnected from: the numeral keys. To move said bar longitudinally, there is secured upon said bar near the left hand end thereof a socket piece 11, into which extends a pin 12 secured upon the lower arm of a lever 13. pivote-dat 14 on the plate 2, the upper end of said lever-being connected by a link 15 with the lower end of a switch lever 16 pivvo'ted at 17 on said plate 2. Stop pins 18 on the late 2'limit the rocking movement of vthe ever 16. 4.Also pivoted at' 19 upon said `plate is a hand lever 2O connected with a link 21 which. at its other end, is connected to a pin 22 secured in the upper end of a lower arm v23 Vpivoted upon thelower end of the switch 1ever16,.said pin also entering a s lot `2-'1 in anupper'arm 25, secured toa short rock shaft 26, which extends througha sleeve '27 in the top ofthe lever 16- and carries upon its rear end an arm 28 (Fig. 7 to the outer end of ,which isconnected a collar 2.9 which slides upon a. rod 30 connected to abracket 31 pivoted u onthe rearside ofthe plate 2. Between s ai bracket 31 and said collar 2'9 is interposed a spring 32 coiled around said rod.

chine, as is well known, each type bar carries two type, of .which oneprints normally and the other only 'when the shift key is d epressed.- All of the nine digits are arranged in the typewriting machine to correspond to what are known -as the lower case lcharacters of the top row of keys 33, so that they may be printed by said keys without using the shift key. Since soineother character than a numeral is also carried on each'nw moral type bar, therefore, if the. shift key is -used,-ar 1 d anumeral. .key operated, said other,

' Shift key conzf'rol. In the Remington ma-v character is'then printed. It is therefore desirable at that time to operatively disconnect the computing mechanism 'from the numeral keys, In the drawings, (see Figs. 2

and 7) 3'1 indicatcsthe typewriter shift key, I which is connected 1n the usual manner by a- 2:2, when saidpi-n has been moved toits extreme right hand position.

The following is the operation:- In t'he` normal positilon of the typewritenin which it is not desired to use the computing mechanism, the parts are in the position shown-in Fig. 3. It will be seen that in this position the slide bar 5 has been moved to the right, and consequently the hooks 7 are disengaged from the eyes 8 and .the computing mecha# nism is disconnected. .It will also be Seen, upon comparing Figs. 3 and-6,' that, if

the shift key 34 be' operated theshort` leg 43, when depressed, will not impinge upon the pin or any part'of theniechanism, so that 'the' printing mechanism-is free tobe actuated in precisely thel same manner as if the computing mechanism were not attached thereto. When it is desired to bring the computing mechanism into continued use, the hand lever 20 is raised, which has the effect ofV moving the link 21 to 'the rightfand swinging' the 'lower and upper arms 23, 25 to the right into the position shown vin Fig. Consequently the rod 3Q also moves to theI right, and, When itl'does so, the rear arm28, in rockingfromits position on ,the left of the pivot 17 to its positionl on the right thereof, depresses the upper end of the coiled spring 32, producing an`11 ward pressure by sa 1d spring against'the co' lar29. This upwardpiessure against said collar 29 Vproduces an upward ress ure against the rock shaft 26, and t e'refore tends to turn the switch llever -16 to the lcft. upon its pi\ 'ot. The turning of the lever upon its pivot correspondingly turns the lever 13, which' moves the slide bar 5 to The numeral keys are thereby all connected the left, into the position shown in Eig. 5.'

with the computing mechanism, which is now adapted for continuous use.

As is well known, in the Remington and other shift key machines,in which the numeral keysare used for printing other char# acters besides numerals, it is while the shift 12S key is held depressed that the striking of a numeral key ca-uses the other character to be printed. It is necessary that the. computing mechanism be' rendered incapable .of operation.. while such', other character. 1s bei'ng 13o printed, and therefore while the shift key is thus held depressed; and it is desirable, for convenience and rapidity of operation, that this disconnection should be done automatically, and that the computing mechanism which is depressed by the depression of the shift key, has impinged uponthe pin 22, and has thereby caused the switch lever 16 to swing upon its pivot 17, and move the slide bar 5 to the right, so as to disconnect the computing mechanismfrom the numeral keys. The parts are then inthe position shown in Fig. 6, in which the pin 22 is on the right of the pivot 17, as are also the Uuide 'rod 30 and the coiled spring' 32. Ience the spring 32 occupies the same position as when the computing mechanism is connected, and, consequently, when the shift key returns to normal position, and carries with it the depressor 40, raising the same from the pin 22, the spring 32 again acts to move theupper part of the lever 16 tothe.

left, so as to move the slide bar V5 to the left and connect the computing mechanism with the numeral keys. In such a osition, since y at their upper ends to bell crank levers 55 the upperend of the lever' 16 1s on the right hand side ofits pivot 17 land thespring 32 exerts an upward pressure against said upper end by means of the rear arm 28the effect of the pressure of said spring, when the shift key is' released, is to swing the lever 16 from the position shown in Fig. 6 to the position shown in Fig. '5.

Temporary reversa-It maybe desired to temporarily disconnect the computing mechanism from the numeral keys, as when it is, desired to print numerals without effecting a computation. For instance, a figure may not have been printed plainly enough, and yet the computing mechanism has been already operated, so that a reprinting of'said figure would have the effect of repeating the addition or subtraction.- Or, on the other hand, it may be desirable in statistical work to print figures at different .points of the writing line of the paper Without computing, so that while the computing mechanismshould be disconnected for themain portion 'of'fthe line, but, "at, certain points on the paper, it might bede'sired to printigures and also make a computation. this, or other cases Where it is desired to print iigures without effecting a computation, a temporary key 46 is used. Thestem'47 of said key Acarries a pin 48 which engages an arm 49 extending from a rock shaft 50, which also carries a short arm 51 connected by a link 52 with the pin 22, whichl is carried by the end of the arm 23, so that the depression of said key 46 has the effect of drawing down the link 52. But, whether the parts be in the position shown in Fig. 3 or in that shownin Fig. 5, in either case a downward pull upon the pin 22 will have the same ultimate effect. For it swings the lever 16 upon its pivot 17, either from the position shown in Fig. 3 to that shown in Fig. 4, or from the position shown in Fig. 5 to that shown in Fig. 6, the effect in either case being to move the parts into the opposite position to that which they would otherwise occupy but for the depression of said key. This effect is continued so long as the temporary key is depressed. The result is that, 1f this temporary key should, be `depressed when the computing `mechanism 1s operatively connected, as shown in Fig. 5, the effect would be to render the computing mechanism inoperative so long as the depression ofthe temporal key continues,

as shown in Fig. 6,' permitting figures to. bev

printed without computation; or, if the temporary key should be depressed when the computing mechanism is disconnected, as shown in4 Fig. 3, the effect would be totempora'rily connect the computin mechanism, as shown' in Fig. 4, andto maintain it c 'on nected, so long as the temporary key is des pressed, so thatthe printing of a figure will correspondingly effect a computation.

Controller- The stems 6 are connected (Fig. 1) supporting a vertical plate 61, carrying posts 62, 'supporting a guide, plateV 63,'having a circular series ofh es, through which 'extend the ends of nine pusher rods 64, pivotally attached to the. several bell crank levers. supported by a` strut 73 connected to the bracket 74 attached to the plate 2. Having its bearing in the-.plate 61 is-a shaft 65 of a 'controlleryor primary escapement .wheel 66, whichf''s willbe presently described, is

undefconstantl rotational pressure. Stop bolts or escapeinent teeth 67, of which there should be 4not less' than ten, though twelve are preferably illustrated, slide in a circularseries of slideways 68 in said controller which `slideways register with the pusher rods 64, and said bolts project to Said plate 63 is additionallythe left" of said controller normally, and.,

until they are displaced by the acti-on of the pusher rods 64. An annular coiledspring v69, which surrounds the" controller in 1a ing pusher rod moved through the guide plate, its end impinges upon the end of one of the stop bolts projecting fromthe left. hand side of the controller, andmovcs said stop bolt to the right, so that'its other end the-n projects from the right handside of said controller( The operation of a numeral key not only thus projects a bolt, butA actu-' ates an escapenient, hereinafter described, for the controller, so that the controller is released-and rotates. Its stoppage, after a certain extent of rotation, is effect-ed by vmeans of the then projected stop bolt impinging' against a rotary stop wheel, or pin ion 7l, (Figs. 8, 9, 10) and theextent of rotation depends updn its circumferential distance from the stop.'wl1eel, when it was .so projected, and therefore upon. the particular pusherrod and the particular key lever which were then operated. Upon the next operation of. a numeral keyand'rota- .tion of the controller, the stop bolt is, by

means of a cam wedge 72 on the, plate and located in the path o f the projected stop bolt, returned to its normal position, 'in which it projects from said controller to the left insteadl of to the fight, and it is retained Yin that coiled spring.

Escapement-Secured upon the front side of said plate 2 is va guideway 75 for a stem 76, the other endof which is pivotally connected to a lever 77 pivoted at` 78 upon the ring'', to the other arm of which lever 77 is secureda s rin(lr 79 which normally tends tovdraw said arm to the left,

and therefore said stem tothe right. Said stem 76 `carries adisk 80, and all `of the. rods 56 pass through holes in said disk.

When any numeralikey has. been oper- -ated, and thereby the corresponding 'rod 56 moved to the left, the block 58, by which it is connected to the bell crank lever 59, then' abutsagainst said dis-k 80, and carries said "disk With it to the left, thus rocking'the lever 77; The Vlong arm of said lever 1s connected 'at its extreme ,end by a. link 81, -with an'arm -82 on an escapement'controlling rock-shaft'83, sothat, by. said move'- ment of said lever,- said escapement shaft is rocked. Said escapement shaft'oarr'ies, ad-` justably two disks 84,85, (Fig. 1.2) spaced apart a 'short distance, and having respectively forrnedin their beveled edges notches or recesses-86, 87, 'offset from each other. Throughlsaid late`61 passes a stop shaft 88, which', ont 4e left side of said plate 61, carries' the before-mentioned stop wheel or 'until the notch S6 therein comes opposite position by the.- annular.

.pinion 7l, which is star-shaped, having points any of which is adapted to lie in the path of a boltl in the controller which has been projected to the ri ht, and arrest said controller it' said stop s aft is at that time itself held fast and non-rotatable.' Secured upon the end of said stop shaftupo n the right hand side of the plate 61, is a. secondaryescapement wheel 89, having the same number of points as the wheel 71, a point of' which'escapelnent wheel normally abuts against the first or rear disk or dog 84. Therefore, when any numeral key hasl been actuated, and thereby the escapement shaft 83 rocked, the disk 84 is-thereby moved to the point of the escapement wheel 89, which can then immediately pass through said notch. This it immediately does, because, as already mentioned, the controller shaft is under constant rotational pressure, so that the preriously projected bolt is pressing against a point of the rotary stop wheel 71. After said point has -passed through said notch 8G', it then 'abuts against the isecond disk 85, and the'stop-shaft is again held from further 'rotatlolr The slight movement thus given to the stop wheel 71 allows the bolt or tooth'67 a'r- Vrested thereby to more only a `very short' distance. Then. upon the release ofthe numeral key, the escapement shaft 83 returns to its original position, in which position the notch 87 in the second disk v85- now comes opposite to the saidbeveled point or arm of the escapementv wheel 89, 4which thereupon escapes therethrough, under the pressure of the projected sto y aniarm of the rotary stop wlieel 71. pressure vrotates the shaft 88 so that the neatI succeeding arm of the' rotar stop bolt against This r wheel is brought into the path of t e last. projected bolt, which then impingesnga-inst 'said latter arm,'thus again producing rota.-

tional pressuxe on the stop shaft, -rotat sai'dshaft until the n ext succeeding pointlii the escapement wheel 89 is brought up against the first escapement disk 84, and theV parts `are then again in their normalposif;

tion, ready for another operation. It Will thus be seen that the extent of movement of y the controller shaft is-depe'ndent upon the angular position, relatively to the rotary sto an therefore upon the particular numeral key whichlis operated..

Drif 'ng-Itv has beenialready intentioned wheel 71, of the pusher rod.act1lated,'

that the controller shaft 65 is under constantUl rotational pressure, tending to rota-te .said shaft Whenever released by the escapement'..

'125" VThis rotation is derived from -any suitable" motor, an electric motor 92 being shownherein. The shaft' 93 of said motor has secured thereon a head 94 to which are cured la" screws 95, the ends of three spring arms 96 (Figs. 8, 29). To the other ends of said arms are secured arcuate shoes 97, which bear against a fiber lining 98 of a cup-shaped head 99 secured upon a shaft 100 having a bearing 'in a bracket 101 secured to the plate 61.

Said shaft 100 has secured thereon a bevel gear 102 which meshes with a bevel gear 103 on a shaft 104 rotating in a bracket 105 secured to the inner side of the plate 61, as shown in dotted lines in Fig. 29, and carries on its outer end a gear wheel 106 which meshes with an idle wheel 107, which in turn meshes with a gear wheel 108 upon the controller shaft 65. It' is by this means that the controller shaft is given a constant rotational pressure always' in -the same direction, rotatlng the shaft whenever it is released. y

In order to vary the amount of friction transmittedfrom the rotating shaft, the outer end of the motor shaft 93 is threaded, and .upon said threaded end is screwed a flanged sleeve 109 which is adapted to bear against the spring arms 96. By screwing said sleeve in or out, the pressure upon said s ring arms, and therefore the pressure of the' shoes 97 against' the lining 98 of the head, is increased or diminished as desired.

- (fomputing nwcham'sm.- The frame of the computing mechanism comprises end plates 110, 111, and a series ofv transverse partitions 112. These partitions are connected by an upper bar 113 and two lower bars 114, 115, and are spaced from each other b v sleeves 116. around the bars. 'Said bars at one end, after passing through the end plate 110 into the pla-terl, are secured by means of screws 117 (Fig.l 13). Upon the other ends of said bars, where they passl through the end plate 111, are screwed nuts 118. washers 119 being interposed between said nuts and the end -plate 111.

Each sleeve 116 is of such length that said sleeve and a partition occupy a longitudinal distance equal to that of four typewriting spaces. Betweentwo' adjacent partitions are interposed three register wheels 120, 4each of the width of one typewriting space, and two spacing washers 121,122,4 next to the respective partitions, which washers andV a partition together occupy a d1stance equal, to one ltypewlziting space. Said register wheels 120 are in the form of rings supported upon a hollow shaft l123 of 'comparatively large diameter, supported by ihc Jpartitions and -end plates. Each register wheel has formed on one side thereof a thin gear 'wheel 124, bymeans ofgwhich. it is rotated in the. manner to be presently described. On each sideof the middle re ,ister wheel is a thin washer 125, shown .1n

detail in Fig. 16, having an upper circular opening 126 which surrounds the hollow shaft 123, thereby supporting the" washer side bythe shelf 129, (Fig. 15) are a series of computing wheels 133, each computingwheel being ofa thicknessequal to one typewriting space. Secured in the artitions are short spacing cylinders 134 o a thickness equal to one typewriting slpace, and co-axial with the computing whee s.

Each computing wheel 133, shownin detail in Fig. 19, is :formed on one side' with I gear teeth 135, adapted to mesh with the gear teeth 124 of the corresponding register wheel, and is also formed, next to. said gear teeth 135, with an annular shoulder 136, upon which is a single carrying tooth 137 forming a lateral extension of one of the gear teeth 1,35. Each computing wheel 133 1s also formed with a reduced hub ortion 138, (Fig. 19) which, of the left'hand one of the computing wheels of a group of three, rotates within the spacing cylinder 134 contained within and secured to the partition on its left.

Through said computing wheels passes a longitudinal'c'omputing shaft 140, rotated in a manner to be presently described, and upon which shaft can slide a sleeve 141. The shaft 140 is' preferably square, and the sleeve has a corresponding square opening fitting snugly on the shaft, so that said sleeve always rotates with the shaft. Said sleeve (Fig. 22) at its advancing end 139 is rounded or tapering, and at the rear end ,is formed with an annular groove 142, and `in said groove are pins 143 projecting inwardly from the end of a non-rotatable tube 144 iop which can telescope around saidsquare shaft out of contact therewith. Said sleeve 141, is formed with actuating pins 145 which are adapted toV engage one or the other of ten recesses 146i formed by internal gear teeth 147 within the computing wheels. As will be presentl described, the tube 144,l and therefo-re a so the sleeve 141, travel within the said computing wheels through a. dis- 'tance of one typewriting spaceI with each step movement of .the typewriter carria e, andin the positions of rest is either at t e middle ofa computing wheel drat the middleof a spacing-cylinder 13 4 betweentwo groups of computing wheels. By the rotary movement of the square shaft, to be pres-4 l ently described, the actuatmg pins 145 are always rotated through an exact .multi le ofone tenthof a revolution, so that, a Vter making a. rotation within anyone comput- ^65 It will thus be Seen that cach computing' ing wheel and thereby causing the computhereinafter described,

'relation to the other wheels.

sition on the next advance to bemoved longitudinally and exactly mesh with some one pair of opposite recesses of the next computing wheel. The rotation thus imparted lto the computing -wheel causes. the register wheel to rotate through a corresponding anguiar distance.

vTrcmafe'r mechansm.Each time that the computing wheel makes .a complete revolution, the single carrying tooth 137 .formed thereon engages one of five lugs 150 of a carrying. wheel 131' loose upon said shaft 130, the gear teeth 132 of which mesh with the external gear teeth 135 on ,the right h'and side ofthe next computing wheel 133 on the left, and said wheel 133 on the left is thereby partly rotated through one-tenth of a revo- 1ution. 'Saidcarrying wheel is also formed with a disk-like portion 151v having five concavities 152 each in an 4are of a circle of ,slightly .greater diameter than that of a transfer cylinder .153, preferablyof rubber or other resilient material, secured to a shaft 15-1-nd` rotated herewith, whltl'i shaft, as constantly rotates. Said shaft 154 is supported in bearings at.

suitable intervals in the partitions and end platcs,0rif desired, may be earried-` only at the ends. 'lien, by the advance of the single carrying tooth 1 3? in tl e manner just explained, the carrying w ieel has been moved through an angular distance corresponding to a part of one-tenth of the revo. lution of the computing wheel, it is then in such a position that one of its projecting portions `155. between two adjacent concavities 152, has been forced into sulliciently close contact with the constantly rotating transfer cylinder 1553, and is rotated with ithe latter until its next concave side 152/, in turn, assumes a position over the rubber bod \y 153 of the. transfer shaft 154.

The. huh of each third carrying wheel is of a snllicient length, as shown at 148 in Fig. 20, to extend through a partition being permanently supported therein to 'carry from the computing wheel on theright hand side. of the partition to the. next computing wheel on'tlie left thereof (seeFig. 14).. Suit able spacing washers l-l-fl are provided to maintain such carrying wheel in its proper 'lhe spacing .cylinders l131 are cut. away, as shown `al 223 to pei-init the carrying thereto to freely rotate.

Tn order to aline the ligures on the register wheels. and to insure that the carrying wheels lill opposite vWheels 131 are not unduly rotated, there is p revided, for each suaili carrying wheel, a

piyoterl arm 15G carrying aroller 157 which is pressed by a spring 158 into one of the concave sides 152 .of said carrying` wheel.

of which cannot take hold of the rubber body of the transfer shaft and rotate with it, unless positively forced thereinto. It will he seen that all of the computing devices contained in the main computing mechanism are operatively connected throughout: the entire series, so that the' whole series can be used for a single column or for a variable number of independent columns.

The entire mechanism is covered by acasing 159 having a slot 219 through which a line of figures on the register wheels is eX` posed to view.

.tionfhe above construction-and arrange'- movement is al 'ays imparted to the' termi! nal member of the group of computing devices, and the other devices'of the 4gioup are merely for the purpose of accumulating the movements thus imparted, it is possible, for all ot' said devices to heeonnected for carrying h v a continuous train of gearing.

lut in ineeliauiSul-sl like the present, in

which it is necessary lo add directly, not. only units, but also tens, hundreds. and se on. such a continuons train of gearing is admissible. l"oi instance, suppose it were. at

tempted to compute with devices so conneeted, and the teiis" device stood at 9, and then an addition were made to the device corresponding to thc hundreds column. the ell'ecl' would be to rotate. not only theV said device, lint also the device ol' the 'lens" column. '.l`l'ie reason for this is Y that` when the tens" ivheel stands al .l,'its

cari-ying" tooth is necessarily in contact with the teeth. or similar devices. `ot' the "hundreds" wheel or of the carrying wheel therefor, and. if the wheels` .iru-gmnneeted inv a continuous train` airv motion ol' thelatter will therefore produce a corrih'lmiulng lnotion of the former. 'ilh the present con'- slrnction lliisi'lillicnltv is avoided inthe fol- 'lowing manner.

.ll should liist be remembered that each computing wheel is positiiel)l geared with its carrying wlwel on 'the right. that is. the carrying wheel which connects it. with the nextconiputing wheel on the right, hut. its

lthe right, geared thereto, will also be rotated, but the latter wheel will not rotate the next computing wheel on Athe right, even though said next computing wheel on the -rightbe standing with its carrying tooth at the position corresponding 4to the isplay'of the figure 9 in addition, or 0 in suhtraction. For, ywhen a computing wheel stands in this position, the five lugs 150 on the carrying wheel on'the left can'freely rotate without coming in contact with the carrying tooth 137. Consequently, there is norotation transmitted from a computing wheel on the left to a computing wheelon the right through the carrying wheel.

- Since, however, the carrying tooth 137 of ig-,comi uting wheel, when either at "9, or at-0, is in`such a position that the five lugs 150 on the carrying wheeldo not engage the same when said ,carryin either direction, it is evi ent that 'said computing .wheel has considerable lost motion,

before it'can be brought into operative engagementV with the live. lugs 150 of the carrying wheel to the left, and it would therefore be impracticable to transmit, through said carrying wheel, to the com.- puting wheel on the left, an amount of rotation, namely, one-tenth of a revolution,

equal to that transmitted to said carrying wheel from the computingwheel operated,-

since the first part of this'rotatioii is made without producin any motion of the said carrying wheel. t is to overcome this difii' cult'y that thetransfer shaft is used, for thereby, 'although the latter partof the motion of one-tenth of a revolution of the computing wheel, after it'comes in through opA .erative engagement with the carrying wlheel on y a on the left, 1s effective in impartin heel, yet this is suilicient, for it is suiiicient to cause a projection 155 of the carrying wheel to engage the rubber cylinder 153 of the transfer shaft, and since the latter is in constant.v

rotation, the transfer shaft completes the ,work which was omitted by the computing wheel in the firstV part of its rotation, and moves the 'carrying wheel through the remainder of the necessary rotation to rotate the-computing wheel on the left through one-tenth of a revolution.

Theprinciple, then, embodied in this mechanism i's, first, to permit the computing wheel to stand in such a position, when at 9 or 0, that the carryin -wheel' on the left can be freelyrotated in either' direction. and, second, because this arrangement neces sarily requires lost motion .of the computing wheel'. rotates vin wheel on the right, to compensate vfor this lost motion by providing extraneous means for rotating the carrying wheel through the latter part of its movement. This carrying wheel rotating means may, however, bel used with many other kinds of tens-carrying parts thereof'as it is necessary to refer to will be desi ated by the aiiix aixed to the numera of thelcorresponding part of the main mechanism.

Addition and subtraction/ The computing shafts 140 140", have respectively secured upon the endsV projecting through the plate 61 -bevel gears 160, 160", which are adapted to be driven by a vertical shaft 161, having at the lower end a bevel gear 162, driven b v a bevel gear 163 upon a horizontal shaft 1M having a bevel .gear 165 driven by a bevel gear 166 uponthe controller shaft 65. When said'controller shaft has been released by the depression .of a numeral key and rotates through an. angular distance corresponding to the numeral key depressed, said rotation is transmitted to the vertical shaft 161 and thence to the shafts 1467 140?, selectively` iii one orthe. other direction by means of sliding clutches 167, 167", slidablefupon saidyertical 'shaft i161 but rotating therewith. By means of a lever 168 the clutch 16"(l is adapted to be brought into operative engagement with either of two bevel gears 169, 170, loose on the shaft 65 and always in engagement with the bevel gear 160. If s'aid lever 168 is moved upward, .thenl the clutch 167. is moved into engagement with a. clutch Vmem-4 her 171 formed within 'the upper bevel 169, therebyrotating' the computing aftin the direction proper for addition. If

said lever is moved' downward, the clutch 167 engages the clutch member 172 of the lower bevel gear and rotates the shaft 140 oppositely to its formerdirection, causing the computing wheels to,suhtract. If said vlever is moved to -a- 'iiiediate position,

the clutch 167 is out of engagement, andA the computing sha-ft 140 does not rotate. order to retain the lever 16S in any position to which it has been moved; there is provided a pivoted bar 17 i.

said har having three notches 176 adapted to .selectively receive the edge of the lever 168.

secured to the front wall '1 (el of a casing 175 around the end gearing.

167". 168", 169", 173", indicate parts for-the -secondary mechanism corresponding tothe parts 167, 168, 16S), 173. of the main mel-ha nism.

shaft 1,61 is 'at rest. .clutches 167, 167. for the computing shaft The transfer shaft 154 has a constant r0- tary movement which is derived from the electricl motor 92 by means of a 'gear wheel 180 on the shaft 93 of the motor, meshing with au idle gear wheel 181,'which in turn meshes with a gear wheel 182 on a shat't 104` car-ryinga bevel gear 1GB which meshes with a bevel gea-r 162 ona vertical shaft 161. with which coperate parts similar in their general construction and arrangement to those imn'iediatelv cooperating with the vertical shaft 161, except as to the form of the clutch sleeve 16T'. which. in this case, has

'only a pair of teeth'lS2 instead of a immcomputation is changed, this must .be donewhile said shaft 161? is in motion, whereas the' direction of motion of. the computing shaft`14() is never changed except when the By arranging that the and for .the transfer shaft-,are actuated by a common lever .168, it is insured thatthe transfer shaft l will alwaysbe rotated in uni- `son with thecomputing shaft.

Groujn'n'r/.-The figure wheels are visibly spaced into groups .of three, each group, together with the spacing means, occupying four writing spaces of the typewriter. The spacing is pieferably effectedby the partitions, one of which is interposed' between each group and the next, as shown in 13', 14, and occupies the fourthwriting 'space` lor a portion thereof. If it occupies less than' der 134, which is of sufiicient internal diamefreely therein.

ter .to permit the actuating pins 145 to rotate Hence said pins have no effeet :on the .computing mechanism, in case i-the' computing'shaft should be. rotated at the time the actuating pins are, atany such fouifth space inthe computing` mechanism` This arrangement provides that, without dis'- connecting the nugifieral key levers from the 'computing inech'u'sm, the' machine is free to operate at cach fourth wri-tiiigspaec without affecting the computing whcels,-so that` ,this spaceI can be used for pointing ofi' the hundreds from the thousands, the. thousandsfrom the millions, and so on, and for sepa rating diferentcolumns, thereby avoiding any derangement of the computing mechain vertical alinemcnt with the actuator pins of the corresponding computing mechanism.

Horizontal com/uiting mcr.'/wnsm.-Tlie secondary mechanism is similar to that ofv the main in the relation of the computing wheels to the ligure wheels, in the general construction ofthe transfer shaft, and in th'c clutch mechanism for shifting both the computing and tTansfer mechanisn'is ilito any one of three "p ositions. to add, to subtract, or for throwing out of operation. The description, therefore, of such parts of the vmain computing mechanism as arc also found in the horizontal computing mechanism applies also thereto, corresponding parts beingr indicated by the atl'ix M for thehorizontal computing mechanism.

One object of the horizontal computing mechanism is to furnish a cross computation of a row ot' figures whether added to, or

'subtracted from, the several columns which are being computed b wthe main computing mechanism, as sai( ligures are progressively written in said columns. This mechanism is also adaptable for a billing machine, that is. a machine b v which there is obtained a balance of one or morel columns in which some items are to be subtracted, as well as others added, the machine being provided with means for obtaining a horizontal coinputatioii of two or more rows. or a balance or difference. of two numbers in a row, to write the total or diil'erencc in a separate column, and at the. same time, to reset the horizontal computing mechanism in readiness for a siniilar. operation` while still retaining the result df each such independent operation in a separate column. the. vertical :oml'iutation of which is retained in the. main computing mechanism.

Iicscff'li'ni/ und (fr/'m' conactivar-The means lor rcvcrsii'ig the.4 direction of rotation oi' the. actuator pins or uiaster wheel 145 provides a convenient means ior reset ting to zero. This means may be ot use eitherto correct the computation of a ligure erroneously printed, or to' 'clea'r a' series of ligureI wheels to zero tobegin a fresh coinputation. If, just before writingthe, result o f'any computation either verticalor hori '/.ontal of a series of numeral-s, tlic' corresponding computii'ig mechanisinhe reversed, then, at the time of soV writing said result, the, ligure wheels of thatmechanisin will he automatically set to zero, ready for the `next computation. I

The writing of the result of thc crosscomlili` putation in this manner would bring 'the gure wheels of the horizontal mechanism to zero, at the same time addin it in a grand total column of themechanism.v The writing of the result of the vertical computation brings the figure wheels of the ver tical. computing mechanism lto zero. The writing of the total of the grand total c'olumn has the same effect upon both the vertical and the horizontal computing mechanisms, and this result proves the accuracy of all'the totals or balances in the vertical columns, in the horizontal rows, and in the grand total column. The above result is all accomplishedl in one continuous Writing of the figures acro the sheet in their'respective columns, in the same Way as matter is written in the ordinary manner by the' typewriter when used for correspondence, the

only other manipula ion necessary being that of reversing the respective computing mechanism before writing any computation of a. row or column.

The arrangement of reversing mechanism,

both, for the horizontal and vertical com-` puting mechanisms, affords means for ob? taining great variability 'in the character of the computations that may be effected thereby. 'For instance, theremay be debit colunms aswell as credit columns, or each individual column, or certain of the columns may contain debits s well as credits, which couldfbe written andcomputed without an'y explanation except the 4use of different co ors, by a machine using a parti-colored ribbon as, for instance, `black for the debits and red for the credits.

In writing such figures in the several columns, representing the debits or credits as the case may be, the proper computations of such figures are simultaneously effected in the vertical and horizontal computing mechanisms as the figures themselves are writtenV horizontally across the'sheet in the -various columns.

Vertical actuator advance-Upon the rear side of the'typewriter carriage is secured by arms 190 a rack ,191. (Figs. 2 and 12) which meshes with a pinion 192' upon a vertical shaft193, suitably Supported in the frame of the machine, on the lower -end of `which is secured a bevel gear 194. which meshes with a bevel'gear 195 on a shaft`196 ported upon theframe ofthe tgp oheend by the plate 61 and `at te extending fromv the rearl to the front of the machine, also suitably .sup orted .on the frame of the machine. On t e front end of said shaft 196 is secured a pinion 197 (Figs.

1,- 2,- 25) which'jmhe's with a rack 198 which is secured to--a frame 199 which has a sleeve 200 having a slot 201 which receives `a feather 202 lon a longitudinal rod 203 Within saidV sleeve, said sleeve 4bein 'thus guided on said rod. Said rod 203 1s-` supewriter at other end by a bracket 205 secured to said frame. From the above construction it will be seen that said frame 199 moves with the typewriter carriage in a step by step movement but in the opposite direction thereto. To an extension 206 of said movable frame is secured the outer end of-the tube 144 which moves the actuating pins 145, and into which the computing shaft 140 telescopes. Horizontal actuator adfvfmc'c..-The tube 1112ix which advances the actuating pins 145* for the horizontal mechanism is connected to a cross piece 212, which is moved by a shifter arm 213, pivoted thereto and is secured to a. sleeve 214 which slides upon a rod 215 secured to the plate 61, and also to a plate 216 supported on the frame of the machine. Said tube 144c slides upon a fixed round shaft 217 secured at its left hand end in the plate 216, and in the right hand end of saidV shaft 217 rotates the end of the s uare computing shaft 140". Secured to sai upper sleeve 214 is a pointer 218 which moves over the display opening 219 in the casing. 159 for the register wheels-.and points to the register Wheel which is in operative position. Secured ytosad cross piece 212 1s a cord 220 which'is'wound around a barrel 221 actuated by a sprin 222,-said s ring tending to draw said mova le frame a ways to the left.

Column etapa-Secured on said frame 199 is a column Stop bar 207 having formedV therein a series of sockets 208. In any one of said sockets 208 can be secured'by means of a screw 209 a column Stop 210 having a projection 211 which, in the operative position of said column sto projects downward, but, when the co umn stopis ar' ranged so that the projection extends Iup'- ward, said column stop is therebyrendered inoperative. The shifter arm 213 carries a shifter 224, having in its upper edge a notch 225, which 1s 'adapted to en ge any of the projections 211'i1'pon theico umn stops 210. -110 i horizontal mechanism 1s also moved to the 120" right in unison with the movement of vthat of the vertical mechanism.

`Actuator returns-Secured upon la stationary support 228 upon the frame fof the. machine is a short 'Karin 229, uponthe'end 125 of which is mounted a -roller 230, and when the shifter arrives at said roller, the latter rides upon the sloping advancing edge 231 of said shifter and thereb depresses the shifter and its arm 213, fw ichl carries the :130

imv

same, against the action of said spring 227.` releasing `the notch from the projection 211 on the column stop. When it is released, it is immediately retracted bythe 5 spring 222, which moves it to the left until the rear sloping edge of theshi'fter impinges against the projection 211 'of the next 'column stop to the left, which in its turn has been advanced into a position to engage said notch. 0n `the rear side of the notch there is formed a low shoulder 233, thc object of which is to prevent any -recoi'l of the shifter when the shoulder 234 on' the right of the notch/strikes said projection, and also to lock the shifter in a position in which the projection 211 engages the notch 225, the spring 227 maintaining said projection and notch in engagement. It will thus be seen that the actuating pins 145* of the horizontal mechanism receive an intermittent advance in unison with 'the actuating pins of the vertical mechanism, the end of such advance bein determined by the position of the rol er 230, which position is such that the actuating pins always cease to advance when they have passed through the last of the computing wheels of the horizontal mechanism. A 4fixed cam 232 engages the sloping edge 232 to disengage the. shifter or hook 224 from the pins 211 during the return of the papercarriage to begin a new line of writing.

Variable adra'ncef-The b ginning of the advance of the actuator pins 145x is variably determined by the position of the column stops 210 which can be adjustably secured in the soc ets in the column stop bar. This permitsthe cross-adding of columns located at different parts of the written page, con- `sidered Widthwise. In said stop bar there is here shown a socket 208 at each fourth Writing space, so that,wherever the column stops are placed, the master wheel or actuatonpins of the horizontal mechanism are arrested at a4 point between two 'groups of "computing wheels and commence ther next advance from such point.` Sockets 208 may also be provided in the column stop bar at eachl u-"ritin'g space as shown in Fig. 1. This is of advantage, when'it is desired to'use the horizontal mechanism by itself and independently of' thel vertical 'mechanisnn as it permits the column to be placed exactly where desired on the worlc sheet.- It will readil)r be seen that the horlzontal mechanism, while so called, is also equally well adapted for con'iputing vertical columns and thus may he. used for billing or other purposes.

i- Then it is desired to use'thc vertical mechanism 'without producing any movement of the parts of the horizontal mechamsn-1,11 'lever 2536 is moved to the right, said lever having u pin 237 which bears down upon the upper edge of the pivoted arm 213, thereby depressing the shifter 224 so that its notch 225 cannot engage any one of the projections 211 of the column stops, and the column stop bar canreciprocate without said column stops producing any effect upon the horizontal computing mechanism. As indicated at Fig. 21, the silencing lever is held faccwise against the wall by the head of the stud on' which the lever ivots, so that said lever will stay Where 1t is placed, so that the machine may be set for the performance of vertical addition only, as aforesaid.

Va'rz'abz'lity'of first column-When the frame 199 of the actuator pins 145 returns to the left with the movement of the typewriter carriage to the right for the purpose of beginning a' new line of writing, a special stop 240 on the column stop bar impinges against a pin 241 secured upon the right hand end of a rack 242 which Vslides ina guidewa4 243, said rack engaging the upper side ofy a pinion 244, the lower side o which is engaged by a lower rack 245, which rack slides in a guideway 246, and therefore moves to the right as the said frame moves to the left.

moves the rack 245 to'the left, and the rac 242 to the right. The rack 245 has-a shoulder or extension 248 which, when it is moved to the right, engages a. pin 249 extending from the shifter 224, and therefore moves A spring 247 around the shaft of the pinion 244, normall to the right with said rack the arm 213 and shifter. W hen the frame 199 re-commences its movement lto the right the upper rack 242 follows its movement under the tension of the spring 247 ,until it reaches its normal position.

The object of the above arrangementis to permit a column of any width, froml three to `twelve figures, commenced at the first writing space of the typewriter to be coinputed in the horizontal mechanismalong with other columns of the same or greater or .less width. Were this mechanism not provided, that result could not'be obtained, for, although it would b e .possible to write a column, say, of three figures wide, at the extremeleft of the writing space, and to actuate the first group of three wheels of the horizontal computing mechanism in cor-,.

rcspondence with the writing of the figures lao of said column, yet said Wheels so actuatedz would not be the proper wheels to be computed with other columns of greater width. For instance, hundreds. tens, and units iniglit'be added, respectively, to hundreds of thousands, tens of thousands and tl1ousands. By the above contrivance it is provided that, when a column of three figures or less is to be computed at the extreme left of the writing line, it is only the computing Wheels on the extreme right of the horizontal computing mechanism that are actuated. If a column six figures wide is written, then the six wheels on the extreme right of the horizontal computing mechanism are actuated, 'and so on, thus assuring that, in all cases 'the computingwheels of the liorizontal mechanism will correspond in denominational value to the several figures of the columns.

The commencement of the computation of such first column is controlled by the position of the first column lsto to which the shifter returns at the end o its first movement when released from the rack upon the return of the typewriter carriage. The actuator of the horizontal mechanism then, advances with the writing ofthe figures until the end of the horizontal mechanism is aga-in reached, when the shifter is again tripped, and returns, and is arrested by the nextcolumn stop, the position of which, in

. its turn, determines the number of figures that may be written in the'next column.

250 indicates a limit sto which. arrests the movement of the horizontal actuator frame to the left. when it would not otherwise be arrested by a column stop.

In Fig. 30 I show a modification of the invention 'in which the horizontal mecha-- nism is duplicated, the vertical. mechanism being omitted, although it is understood that the verticalxnechanism can also be used if desired. This arrangement is very advantageous for billing urposes. For instance,

4the items ofthe bil may be set down in a i column'and `computed by one of the mechaat that time inoperative.

column, to the right or leftofrthe firs-tl column, the 'up er mechanism-is thereby reset to -zero, whi e thetotal is retained in ,the lower mechanism. This opera-tion maybe repeated a number of tmesnd the` grand -total obtained by the lower mechanism.

Then, after so obtaining the grand total-,fthe

lower mechanism may be set for subtraction and the grand total written down in a third column, thus resetting the lower mechanism to zero. Or, instead of puri suing the above method, Ia discount may be taken, or any amountl deducted, from any one or more of the totals, the lower mechanism being at that time and for that purpose set for subtraction, and by setting the lower mechanism to the inoperativeposition the balance may be placed in the third same or another column and at the same time retained in the lower mechanism.

It will readily be seen that either of said mechanisms can be o erated, either for addition or for subtraction, the other bein in operative, or the two mechanisms can oth be used for addition or for substraction', or either for addition and the other for subtraction.

When itis desired to increasethe number of such columns and the successive opera-l tions, three or more such horizontal mechanisms can be used in the same manner.

' Another method in which the construction l mechanism to zero, the cross computations computed,

of such rows being retained' and in the lower mechanism until the computation is complete.

.Speed controla-By means of the escapement I provide two'safety controls.

It is to be remembered that, at the time a numeral key is depressed, the actuating eel 145 are not within the computing w which is to be rotated b the next. depression of said numeral ke ut are still within the computing wheel ast rotated, orin a position to have been rotated, and that, before the computation to be effected ,bythe depression of a numeral'key takes '-plaoe, it is necessary that the actuatin' brought into engagement wit the computing wheel by which the desired computation V is 4to be eiected. If the rotary motion of the actuator pins were to commence before the said pins left the one com uting wheel and entered the next, evident y confusion and incorrect. computation would result. The object, therefore, of the first safety con trol is to prevent an rotation of the com-y puting shaft before t e typewriter carriage, which is the means of bringing said actuatin' its movement. n o

It is alsoevident that if a-second numeral key were struck while the computing shaft and controller were still rotating, the proper stop bolt 67 in the controller mi ht not be arrested by the stop wheel 7,1, an the computation would be rendered erroneous or the mechanism renderedinoperative. I therefore provide the followin The escapement shaft 3 containi the disks 84, 85, is slidable longitudinally, and

pinsV be first g pins into proper position, has'completed.

izs

safety controls:

, 'special efforts arelnade to do so,

is pressed in a longitudinal direction by a position for a time, which, however, is very minute,until ,the next point of the escapement wheel 89 strikes the first disk 84.- on said shaft 83, and therefore again 4moves said shaft longitudinally against the pressure of said spring 252. To said shaft 83 is secured a plate 253, which in fact, forms an extension of the arm 82 to which is attached the link 81. When the escapement shaft 83 is rockedso as to permit the point .of the escapement wheel which was in engagement with the second disk to pass throu h the notch therein, said plate 253 has, the rocking of said shaft 83, been moved ownward, and, as soonas said point asses through said notch 87, in the rear dis the spring 252-n1oves the shaft 83 longitudinally into such a position that the upper edge of said plate 253 lies underneath a 4fixed pin 254i projectingfrom a bracket 255. `The computation 1s completed when the next point of the escapement wheel arrives at the firstdisk 84 on the escapgment shaft, and, if another numeral key be `struck before the computation is completed, said key cannot be depressed, for the reason that the depression o f said key can only beleffected by rocking said escapement shaft 83 by means of 4the link 81, which cannot be done, because the plate 253- is still immediatelybeneath the pin 254, and therefore cannot be raised. But, as soon as said next point of the escapement wheel 89 impin es against the first disk of the escapement isk of the escapenient shaft,then the pressure of said wheel 89- on said shaft-83, overcomesthe pressure of the spring 252-V and moves the shaft 83 against said spring, so that the edge of the plate 253 is now moved in a'parallel direction from underneath ,the pin -254: so that said plate-is freetol move upward and the shaft 83 isp-free to rock -and'the numeralkey l can be depressed! This speed control is not necessary for any ordinary-usage of the machine, and is only included to make it absolutely impossible to produce an incorrect computation even if or to eliminate any possibility' of. .overspeedinoF which a, result in the computation migllit be produced similar to that produced in excessively.. rapid) writing, when -one letter is written partly over 'another because the carriage y has not completed -V movement fore the next printing takes place.

T he second safety control is effected by the following mechanism. The' plate 253' is extended and bent at right angles to form a lip 255, Fig. 29, the lower edge of which lip is ada )ted to be engaged by a notch 256, forme in a latch 257 pivoted at 258 to a bracket 259 secured upon the plate 61. Said latch is normally pressed Vtoward said lip by means of a spring 260, and is connected by' a link 261 with an arm 262 on a rock shaft 263 having suitable bearings on 'the frame of the machine, (one only shown,) said rock shaft 263 carrying an Vupwardly extending arm 264, to the upper end of which is connected a link 265 which slides in a guideway 266, and carries a roller 267.. Said roller is adapted to enter the recesses be. tween. the teeth of the escapement wheel 268 of the typewriter. Then the roller is in one of'sad recesses, in the normal position of rest, the lip 255l is beneatha beveled edge 269 ofthe latch, but, upon the depression of a 1111- mcral key.and the rocldng of the escapemont shaft, the upper edge of saidlip 255* engages said beveled edge, and while depressing said-latch risesto a position above said notch 256. xBy the movement of vthe typewriter escapement wheel. 268, which presses Ioutward said roller 267, the latch 257 is withdrawn at the time' that the roller 267 is at the extreme point of the tooth on said escapemen wheel.

down, as shown in Fig. 12. The release of the numeral key simultaneously permits the -escapeinent shaft 83 to rock, which it does under the action of the spring 79, and at thesame time allows the roller 267 to pass the point of the typewriter escapement wheel,

and thereby allows, the spring 260 to move the latch 256 inward against. the lip 255of the plate 253. But, on account of the downward movement of said plate 255 simultane- The parts Aare in. suclr position w ien the numeral key isheld ously with the'ro'cking of the escapement notch in the second disk, so that the car- Y riage has completed its movement before the computing'moveme'nt begins.

Fam-hspace Zoccf-It has already been' explained thatwhile, on the depressonpf a numeral key when the printing polnt 1s at y -each fourth writingspace of the typewriter, the numeral 4will be printed, the computingmechanism willnot thereby be effected, because, `although the actuating pins' are,- atthe time of such depression, Within-the third wheel of the group of three computing wheels to the left, yet, upon the release of the numeral key and the consequent movement of the typewriter carriage,said actuating pins' mcye into theopen space between the groups -of computing wheels inl which- 

